Contents

Overview

This is a simple breakout for the ADXL345 accelerometer and the ITG-3200 gyro, giving full 6 degrees of freedom. The sensors communicate over I2C and one INT output pin from each sensor is broken out, see the schematics below.

The schematics is also available as PDF.[1]
Eagle files are available from the Sparkfun product page.[2]

Interfacing

This is a 3.3V device and therefore it needs a level converter to connect it to a 5V Arduino. Remember to use the TX lines to get bi-directional conversion.

On Arduino we can also use the Wire library. However, note that the Wire library uses 7 bit addresses. In fact, I2C addresses are only the upper 7 bit the last bit indicating whether we read (1) or write(0). For the case of the ITG-3200:

Write: 0xD0 = 11010000

Read: 0xD1 = 11010001

There is the issue of Wire library not supporting reading from a specific register[3]. As the discussion shows, there is a workaround and the new readFrom method will be included in Arduino 023. Moreover, the page links to ADXL345 and ITG-3200 drivers specifically written for Arduino[4][5].